r334810 introduced zfs_unlinked_drain() dispatch to taskqueue on every deletion of a file with extended attributes. Using system_taskq for that with its multiple threads in case of multiple files deletion caused all available CPU threads to uselessly spin on busy locks, completely blocking the system. Use of single dedicated taskqueue is the only easy solution I've found, while in would be great if we could specify that some task should be executed only once at a time, but never in parallel, while many tasks could use different threads same time. Sponsored by: iXsystems, Inc. |
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